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accurately determining the amount of radial play in a ball bearing

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17 replies to this topic

#16 Alan Elzer

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Posted 12 January 2018 - 09:24 AM

Great article Jim, always enjoy your details.

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#17 RC 90 Boat

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Posted 12 January 2018 - 07:13 PM

Excellent technical information jim, i will have to dust off my dial indicators and micrometers .

#18 Jim Allen

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Posted 22 January 2018 - 08:08 PM

It is a fact, that radial ball bearing inner & outer races are "NOT" designed to support themselves. Without the press fit of the steel crankshaft into the inner race & the shrink fit of the aluminum housing on the outer race, bearing life will be greatly compromised. Doing both things will require bearings with a cold radial amount that is greater than a typical C-3 (.0002" to .0005") or a C-4 (.0005" to .0008") radial clearance amount. A C-5 (.0008" to .0011") radial clearance amount may suffice in some applications. For a hardened steel front end that uses a #6002 bearing, a special radial clearance amount of  .0014" to .0017" will be necessary. A #6000 bearing in the same hardened steel front end has a special radial clearance amount of .0011" to .0015".


Jim Allen

Edited by Jim Allen, 25 January 2018 - 10:09 PM.